diff --git a/package.json b/package.json
index 630fdfe..530d7cb 100644
--- a/package.json
+++ b/package.json
@@ -21,14 +21,14 @@
   },
   "devDependencies": {
     "browserify": "=13.0.0",
-    "chai": "^3.5.0",
+    "chai": "=3.5.0",
     "eslint": "=1.5.0",
     "eslint-config": "git://github.com/dabapps/eslint-config.git",
-    "eslint-plugin-react": "^4.2.3",
-    "istanbul": "^0.4.2",
-    "jsonlint": "^1.6.2",
-    "mocha": "^2.4.5",
-    "sinon": "^1.17.3",
-    "sinon-chai": "^2.8.0"
+    "eslint-plugin-react": "=4.2.3",
+    "istanbul": "=0.4.2",
+    "jsonlint": "=1.6.2",
+    "mocha": "=2.4.5",
+    "sinon": "=1.17.3",
+    "sinon-chai": "=2.8.0"
   }
 }